CA2005329A1 - High temperature insulation - Google Patents
High temperature insulationInfo
- Publication number
- CA2005329A1 CA2005329A1 CA 2005329 CA2005329A CA2005329A1 CA 2005329 A1 CA2005329 A1 CA 2005329A1 CA 2005329 CA2005329 CA 2005329 CA 2005329 A CA2005329 A CA 2005329A CA 2005329 A1 CA2005329 A1 CA 2005329A1
- Authority
- CA
- Canada
- Prior art keywords
- shell
- insulation
- elements
- mineral
- high temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/12—Arrangements for supporting insulation from the wall or body insulated, e.g. by means of spacers between pipe and heat-insulating material; Arrangements specially adapted for supporting insulated bodies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/14—Casings modified therefor
- F01D25/145—Thermally insulated casings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
- F05D2300/614—Fibres or filaments
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
Abstract
Method of heat insulating a surface of a high temperature.
Abstract of the Disclosure A method of heat insulating surfaces of a high temperature comprising mounting a shell at a distance from the surface to be insulated and packing the space between the surface and the shell with separate insulation elements, each element consisting of a cover of a heat resistant material and containing loose mineral fibre material.
Abstract of the Disclosure A method of heat insulating surfaces of a high temperature comprising mounting a shell at a distance from the surface to be insulated and packing the space between the surface and the shell with separate insulation elements, each element consisting of a cover of a heat resistant material and containing loose mineral fibre material.
Description
~t~3~3~
This ;nvention relates to a method of heat insulating a surface of a high temperature, e.g. the surface of a power turbine, compr;sing the use of mineral fibres as insulation material.
Without insulation the surface temperature of a turbine may rise to 500O during operation.
The object of insulating a power turbine housing is to maintain the surface temperature of the turbine housing at a sufficiently low value, e.g. 40C, to allow the operators to work comfortably in proximity to the turbine and to maintain a high turbine efficiency and obtain a satisfactory heat economy.
Furthermore, it is desirable to maintain a constant temperature in order to avoid undesired stress in the material.
In a known method of heat insulating power turbines, a layer sf mortar containing mineral fibres , i.e. a mixture of mineral fibres, cement and water, is sprayed onto the turbine housing to obtain a layer of a thickness of e.g. 150 mm. Due to the vibrations it is sometimes necessary to reinforce the layer thus formed with a wire netting.
A power turbine is ordinarily dismantled and checked at suitable intervals, e.g every 3rd or 4th year. Such a check-up typically takes about ~3 weeks, one week for removing the mortar layer, 5 weeks ~or the actual check-up and necessary repairs, if any, and the last 2 weeks for re-establishing the layer of mortar.
Because o~ the lar~e sums invested in turbines for po~er stations it is essential that the stand still is as short as possible.
Therefore, there is a need for reducing as much as possible the time required to remove and to re-establish the insulation layer on the turbine housing.
As mentioned above the use of a mortar insulation requires a zg~a3~j3~3 relatively long period for removing and re-establishing the insulation layer, and furthermore the removal of the layer causes contamination of the building in which the turbine is located. These operations therefore require the construction of a tent surrounding the turbine. The re-establishment of the mortar layer is a time consuming operation because the new mortar layer oFten has to be sprayed on to the turbine in steps with intervening drying periods.
Besides, it may be difficult to avoid that the mortar layer cracks or falls off iust as it may be difficult to make the mortar layer f;t tightly to the turbine housing due to its poor adhesion.
The object of this invention is to avoid or substantially reduce the drawbacks of the above mentioned prior art insulating method.
This object is obtained with the method of the invention which method comprises mounting a shell at a distance from the surface to be insulated and packing the space between said shell and said surface with separate insulat;on elements, each compr;sing a cover of a heat resistant material and containing loose mineral fiber material.
The method accord;ng to the invention presents the advantage that the construct;on of the shell and the f;ll;ng of the space thus formed with insulation elements may take place gradually thereby mak;ng it possible to check at suitable intervals that the insulation elements are packed properly and that an efficient ;nsulat;on is obtained.
A further advantage offered by the insulation formed by the method of the invention is that it is strongly sound absorbing thereby elim;nating the need for providing a separate outer sound shell when insulating e.g. turbines.
The shell ;n question serves only to delimit a space surrounding the surface to be insulated and, therefore, it should only be capable of resisting the pressure exerted by the relatively light insulation i~0(1532~
elements. Thus, the shell may consist of a relatively thin and readily workable material, e.g. a thin metal sheet. The shell is preferably made from plate-shaped elements in cases where it is desired to provide an insulation having a smooth surface.
In a particularly preferred embodiment of the method of the invention a shell is used consisting of sand~ich elements having a mineral wool core with a metal sheet, such as a steel sheet, attached to each side of the core by means of a binder Thus, a dobble insulation is obtained, i.e. an inner insulation layer formed by the insulation elements which are placed in the space between the surface to be insulated and the shell, and an outer insulation layer formed by said sandwich elements. The outer insulation layer will thus work as a safety insulation layer ;n case of defects in the inner insulation layer.
However, the shell may also consist of a rigid netting provided the mesh size of the netting is such that the insulation elements are retained in the netting.
After the above mentioned shell has been established, the space between the surface to be insulated and the shell is readily filled with insulation elemehts. Since these elements are readily deformed the insulation elements can be closely packed in connection with the filling of said space so that no holes are left in the insulation.
In cases where the surface to be insulated comprises protruding anchor bolts, which is often the case with turbine housings, spacers for supporting the surrounding shell may be attached to said anchor bolts. A well defined space between the surface to be insulated and the surrounding shell is thereby obtained.
When the insulation layer is to be dismantled, optionally after dismantling of the shell, the insulation elements are removed. These elements will ordinarily remain intact and can therefore be re-used when an efficient heat insulat;on is to be re-established after a 2~5329 check, if any, has been completed. Thus, it ;s unnecessary to take special precautions to protect the surroundings, such as the construction of a tent, when the insulation layer is dismantled and re-established.
because of the possibility of re-llsing the insulation elements, the costs of materials can be kept at a minimum.
German published patent specification No. 36 44 531 A1 discloses a method of providing a fire proof filling of shielding holes in walls and floors, and particularly holes with cable inlets. In this known method bags of yarn of ceramic fibres and containing a light refractory material, such as ceramic granules, are placed in the holes and around the cable or cables.
Dutch patent application No. 8400351 discloses a method of insulating cellar space by means of an insulation material in the form of e.g. mineral wool contained in bags or sacks.
None of these prior art methods relates to high temperature insulation and no space defining elements are mounted at a distance from the surface to be insulated.
As mentioned above the insulation elements used consist of a cover of a heat resistant material which cover contains loose mineral fibres.
"Heat resistant" used herein means that the material can be heated to a temperature of at least 100C without melting or decomposing.
The covers used preferably consist of a woven or non-woven fibre material, e.g. nylon fibres, glass fibres, coal fibres, ceramic fibres and/or aramide fibres. The cover may also consist of other materials, e.g. a thin perforated metal foil. Covers of such ~erforated metal foil offer the advantage of also being heat reflecting to some degree.
~al05~29 By varying the size of the holes of the perforated foil and the density of the woven or non-woven fibre material it is also possible to control the release of dust from the insulation elements.
The elements preferably have a thickness of a few cm and surface dimensions ranging from a few cm up to 50-100 cm. For a given insulation task insulation elements of different sizes are preferably used in order to allow the insulation elements to be packed as closely as possible.
The mineral fibre material contained in the covers preferably contains no binder as several binders tend to decompose and to give off large amounts of gas under high temperature conditions.
Preferred mineral fibres are rock wool fibres, glass fibres, carbon fibres and ceramic fibres. Rock wool fibres are particularly preferred because they are heat resistant at temperatures up to 1100C and because they are relatively inexpensive.
Although the method of the invention primarily has been described with reference to the heat insulation of power turbines it should be understood that it is also suitable for use in the insulation of e.g. furnaces and boilers, including boilers for use in district heating plants and steam boilers.
The invention will now be described in further detail with reference to the drawing in which Fig. 1 shows a cross sectional view of a turbine housing provided with heat insulation prepared by a preferred embodiment of a method of the invention and Fig. 2 shows part of the cross sectional view according to Fig. 1 on an enlarged scale.
The drawing shows a steam turbine housing 1 having externally ~30 5;3~3 protruding bolts 2. The free end 3 of each bolt 2 has a thread, and said end is attached to one end of a spacer 5 by means of nuts 4, the opposite end of said spacer be;ng connected with a shell 6 surrounding the steam turbine housing 1. The space between the steam turbine housing 1 and the shell 6 ;s f;lled w;th a large number of a insulation elements 7, each consisting of a cover of a heat res;stant material and containing a mineral fibre material.
This ;nvention relates to a method of heat insulating a surface of a high temperature, e.g. the surface of a power turbine, compr;sing the use of mineral fibres as insulation material.
Without insulation the surface temperature of a turbine may rise to 500O during operation.
The object of insulating a power turbine housing is to maintain the surface temperature of the turbine housing at a sufficiently low value, e.g. 40C, to allow the operators to work comfortably in proximity to the turbine and to maintain a high turbine efficiency and obtain a satisfactory heat economy.
Furthermore, it is desirable to maintain a constant temperature in order to avoid undesired stress in the material.
In a known method of heat insulating power turbines, a layer sf mortar containing mineral fibres , i.e. a mixture of mineral fibres, cement and water, is sprayed onto the turbine housing to obtain a layer of a thickness of e.g. 150 mm. Due to the vibrations it is sometimes necessary to reinforce the layer thus formed with a wire netting.
A power turbine is ordinarily dismantled and checked at suitable intervals, e.g every 3rd or 4th year. Such a check-up typically takes about ~3 weeks, one week for removing the mortar layer, 5 weeks ~or the actual check-up and necessary repairs, if any, and the last 2 weeks for re-establishing the layer of mortar.
Because o~ the lar~e sums invested in turbines for po~er stations it is essential that the stand still is as short as possible.
Therefore, there is a need for reducing as much as possible the time required to remove and to re-establish the insulation layer on the turbine housing.
As mentioned above the use of a mortar insulation requires a zg~a3~j3~3 relatively long period for removing and re-establishing the insulation layer, and furthermore the removal of the layer causes contamination of the building in which the turbine is located. These operations therefore require the construction of a tent surrounding the turbine. The re-establishment of the mortar layer is a time consuming operation because the new mortar layer oFten has to be sprayed on to the turbine in steps with intervening drying periods.
Besides, it may be difficult to avoid that the mortar layer cracks or falls off iust as it may be difficult to make the mortar layer f;t tightly to the turbine housing due to its poor adhesion.
The object of this invention is to avoid or substantially reduce the drawbacks of the above mentioned prior art insulating method.
This object is obtained with the method of the invention which method comprises mounting a shell at a distance from the surface to be insulated and packing the space between said shell and said surface with separate insulat;on elements, each compr;sing a cover of a heat resistant material and containing loose mineral fiber material.
The method accord;ng to the invention presents the advantage that the construct;on of the shell and the f;ll;ng of the space thus formed with insulation elements may take place gradually thereby mak;ng it possible to check at suitable intervals that the insulation elements are packed properly and that an efficient ;nsulat;on is obtained.
A further advantage offered by the insulation formed by the method of the invention is that it is strongly sound absorbing thereby elim;nating the need for providing a separate outer sound shell when insulating e.g. turbines.
The shell ;n question serves only to delimit a space surrounding the surface to be insulated and, therefore, it should only be capable of resisting the pressure exerted by the relatively light insulation i~0(1532~
elements. Thus, the shell may consist of a relatively thin and readily workable material, e.g. a thin metal sheet. The shell is preferably made from plate-shaped elements in cases where it is desired to provide an insulation having a smooth surface.
In a particularly preferred embodiment of the method of the invention a shell is used consisting of sand~ich elements having a mineral wool core with a metal sheet, such as a steel sheet, attached to each side of the core by means of a binder Thus, a dobble insulation is obtained, i.e. an inner insulation layer formed by the insulation elements which are placed in the space between the surface to be insulated and the shell, and an outer insulation layer formed by said sandwich elements. The outer insulation layer will thus work as a safety insulation layer ;n case of defects in the inner insulation layer.
However, the shell may also consist of a rigid netting provided the mesh size of the netting is such that the insulation elements are retained in the netting.
After the above mentioned shell has been established, the space between the surface to be insulated and the shell is readily filled with insulation elemehts. Since these elements are readily deformed the insulation elements can be closely packed in connection with the filling of said space so that no holes are left in the insulation.
In cases where the surface to be insulated comprises protruding anchor bolts, which is often the case with turbine housings, spacers for supporting the surrounding shell may be attached to said anchor bolts. A well defined space between the surface to be insulated and the surrounding shell is thereby obtained.
When the insulation layer is to be dismantled, optionally after dismantling of the shell, the insulation elements are removed. These elements will ordinarily remain intact and can therefore be re-used when an efficient heat insulat;on is to be re-established after a 2~5329 check, if any, has been completed. Thus, it ;s unnecessary to take special precautions to protect the surroundings, such as the construction of a tent, when the insulation layer is dismantled and re-established.
because of the possibility of re-llsing the insulation elements, the costs of materials can be kept at a minimum.
German published patent specification No. 36 44 531 A1 discloses a method of providing a fire proof filling of shielding holes in walls and floors, and particularly holes with cable inlets. In this known method bags of yarn of ceramic fibres and containing a light refractory material, such as ceramic granules, are placed in the holes and around the cable or cables.
Dutch patent application No. 8400351 discloses a method of insulating cellar space by means of an insulation material in the form of e.g. mineral wool contained in bags or sacks.
None of these prior art methods relates to high temperature insulation and no space defining elements are mounted at a distance from the surface to be insulated.
As mentioned above the insulation elements used consist of a cover of a heat resistant material which cover contains loose mineral fibres.
"Heat resistant" used herein means that the material can be heated to a temperature of at least 100C without melting or decomposing.
The covers used preferably consist of a woven or non-woven fibre material, e.g. nylon fibres, glass fibres, coal fibres, ceramic fibres and/or aramide fibres. The cover may also consist of other materials, e.g. a thin perforated metal foil. Covers of such ~erforated metal foil offer the advantage of also being heat reflecting to some degree.
~al05~29 By varying the size of the holes of the perforated foil and the density of the woven or non-woven fibre material it is also possible to control the release of dust from the insulation elements.
The elements preferably have a thickness of a few cm and surface dimensions ranging from a few cm up to 50-100 cm. For a given insulation task insulation elements of different sizes are preferably used in order to allow the insulation elements to be packed as closely as possible.
The mineral fibre material contained in the covers preferably contains no binder as several binders tend to decompose and to give off large amounts of gas under high temperature conditions.
Preferred mineral fibres are rock wool fibres, glass fibres, carbon fibres and ceramic fibres. Rock wool fibres are particularly preferred because they are heat resistant at temperatures up to 1100C and because they are relatively inexpensive.
Although the method of the invention primarily has been described with reference to the heat insulation of power turbines it should be understood that it is also suitable for use in the insulation of e.g. furnaces and boilers, including boilers for use in district heating plants and steam boilers.
The invention will now be described in further detail with reference to the drawing in which Fig. 1 shows a cross sectional view of a turbine housing provided with heat insulation prepared by a preferred embodiment of a method of the invention and Fig. 2 shows part of the cross sectional view according to Fig. 1 on an enlarged scale.
The drawing shows a steam turbine housing 1 having externally ~30 5;3~3 protruding bolts 2. The free end 3 of each bolt 2 has a thread, and said end is attached to one end of a spacer 5 by means of nuts 4, the opposite end of said spacer be;ng connected with a shell 6 surrounding the steam turbine housing 1. The space between the steam turbine housing 1 and the shell 6 ;s f;lled w;th a large number of a insulation elements 7, each consisting of a cover of a heat res;stant material and containing a mineral fibre material.
Claims (7)
1. A method of heat insulating a surface of a high temperature comprising the use of mineral fibres as insulation material, comprising the steps of mounting a shell at a distance from the surface to be insulated and packing the space between said shell and said surface with separate insulation elements, each element comprising a cover of at heat resistant material and containing loose mineral fibre material.
2. A method according to claim 1, comprising the use of a shell consisting of a thin metal sheet.
3. A method according to claim 1, comprising the use of a shell consisting of sandwich elements made from a mineral wool core and a metal sheet attached to each side of the core by means of a binder.
4. A method according to claims 1, 2 or 3 for insulating a surface provided with protruding anchoring means, comprising attaching the shell to the anchoring means by means of connectors.
5. A method according to any of the preceding claims, wherein the covers of the insulation elements consist of a woven or non-woven fibre material.
6. A method according to any of the preceding claims, wherein the insulation elements are of different sizes.
7. A method according to any of the preceding claims, wherein the mineral fibre material consists of binder-free rock wool.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK701888A DK160962C (en) | 1988-12-16 | 1988-12-16 | PROCEDURE FOR THERMAL INSULATION OF A HIGH TEMPERATURE AREA |
| DK7018/88 | 1988-12-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2005329A1 true CA2005329A1 (en) | 1990-06-16 |
Family
ID=8149193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2005329 Abandoned CA2005329A1 (en) | 1988-12-16 | 1989-12-13 | High temperature insulation |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0448576B1 (en) |
| AU (1) | AU4807890A (en) |
| CA (1) | CA2005329A1 (en) |
| DK (1) | DK160962C (en) |
| WO (1) | WO1990007080A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005102782A1 (en) | 2004-04-21 | 2005-11-03 | Etis Ag | Insulation |
| DE202006009673U1 (en) | 2006-06-21 | 2006-08-24 | Etis Ag | Heat and noise insulation jacket for automotive components e.g. catalytic converter or silencer |
| RU2675298C2 (en) * | 2014-03-28 | 2018-12-18 | Роквул Интернешнл А/С | Insulated pipe system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1486347A (en) * | 1976-08-10 | 1977-09-21 | Buckley N | Heat insulation article |
| DE3049871A1 (en) * | 1980-04-15 | 1983-03-10 | Grünzweig + Hartmann Montage GmbH, 6700 Ludwigshafen | HEAT INSULATION CASSETTE |
| DE3534757A1 (en) * | 1985-09-28 | 1987-04-09 | Didier Werke Ag | HOT GAS GUIDE COMPONENT, ESPECIALLY EXHAUST GAS GUIDE COMPONENT FOR COMBUSTION ENGINES, AND METHOD FOR THE PRODUCTION THEREOF |
-
1988
- 1988-12-16 DK DK701888A patent/DK160962C/en not_active IP Right Cessation
-
1989
- 1989-12-12 EP EP90900086A patent/EP0448576B1/en not_active Expired - Lifetime
- 1989-12-12 AU AU48078/90A patent/AU4807890A/en not_active Abandoned
- 1989-12-12 WO PCT/DK1989/000289 patent/WO1990007080A1/en active IP Right Grant
- 1989-12-13 CA CA 2005329 patent/CA2005329A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO1990007080A1 (en) | 1990-06-28 |
| DK701888D0 (en) | 1988-12-16 |
| DK160962B (en) | 1991-05-06 |
| DK701888A (en) | 1990-06-17 |
| EP0448576B1 (en) | 1993-04-21 |
| DK160962C (en) | 1991-10-28 |
| EP0448576A1 (en) | 1991-10-02 |
| AU4807890A (en) | 1990-07-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4276332A (en) | Fire proof cable tray enclosure | |
| US3742670A (en) | Protector for high temperature furnace insulation supports | |
| US4440099A (en) | Ceramic fiber modular assemblies for lining furnace walls | |
| US4291514A (en) | High temperature enclosures | |
| EP0097482A1 (en) | Refractory coverings for application to fluid conveying members | |
| CA2005329A1 (en) | High temperature insulation | |
| US4151693A (en) | Refractory/insulating modules and method of making same | |
| US4344753A (en) | Method for reducing the thermal inertia of a furnace or oven wall and insulated wall produced thereby | |
| GB2103331A (en) | Heat-insulating casing for elongate constructional parts | |
| JPH0526408B2 (en) | ||
| RU2826950C1 (en) | Cable penetration with sleeve impregnated with fire-retardant coating with loose mineral wool filler and refractory fibre | |
| GB2039829A (en) | An Insulating Block | |
| RU2826926C1 (en) | Cable penetration with loose mineral wool filler impregnated with fire-retardant coating and fire-resistant fibre | |
| RU2828070C1 (en) | Cable penetration with sleeve and mineral wool filler impregnated with fire-retardant coating | |
| RU2826953C1 (en) | Cable penetration with bonded refractory fibre for several cables in sleeves | |
| RU2828058C1 (en) | Cable penetration with refractory fibre | |
| RU2828072C1 (en) | Cable penetration with refractory fibre and sleeve | |
| RU2828077C1 (en) | Cable penetration with refractory fibre for several cables in sleeves | |
| RU2827144C1 (en) | Cable penetration with dense refractory fibre and sleeve | |
| RU2826949C1 (en) | Cable penetration with refractory fibre with binding and sleeve | |
| RU2828090C1 (en) | Cable penetration with dense refractory fibre and several sleeves | |
| RU2828078C1 (en) | Cable penetration with mineral wool filler impregnated with fire-retardant coating and fire-resistant fibre for several cables in sleeves | |
| RU2828086C1 (en) | Cable penetration with bonded refractory fibre and sleeve | |
| RU2828063C1 (en) | Cable penetration with refractory fibre for several cables | |
| RU2828061C1 (en) | Cable penetration with mineral wool filler impregnated with fire-retardant coating for several cables |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |